EP2835277A1 - Support assembly for supporting a free end of a parabolic leaf spring - Google Patents

Support assembly for supporting a free end of a parabolic leaf spring Download PDF

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Publication number
EP2835277A1
EP2835277A1 EP14180402.1A EP14180402A EP2835277A1 EP 2835277 A1 EP2835277 A1 EP 2835277A1 EP 14180402 A EP14180402 A EP 14180402A EP 2835277 A1 EP2835277 A1 EP 2835277A1
Authority
EP
European Patent Office
Prior art keywords
support member
leaf spring
support
assembly
free end
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP14180402.1A
Other languages
German (de)
French (fr)
Other versions
EP2835277B1 (en
Inventor
Shane Nugent
Poul JOHANSEN
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nugent Engineering Ltd
Original Assignee
Nugent Engineering Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nugent Engineering Ltd filed Critical Nugent Engineering Ltd
Publication of EP2835277A1 publication Critical patent/EP2835277A1/en
Application granted granted Critical
Publication of EP2835277B1 publication Critical patent/EP2835277B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G11/00—Resilient suspensions characterised by arrangement, location or kind of springs
    • B60G11/02—Resilient suspensions characterised by arrangement, location or kind of springs having leaf springs only
    • B60G11/10—Resilient suspensions characterised by arrangement, location or kind of springs having leaf springs only characterised by means specially adapted for attaching the spring to axle or sprung part of the vehicle
    • B60G11/107—Sliding or rolling mountings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G11/00—Resilient suspensions characterised by arrangement, location or kind of springs
    • B60G11/02—Resilient suspensions characterised by arrangement, location or kind of springs having leaf springs only
    • B60G11/10—Resilient suspensions characterised by arrangement, location or kind of springs having leaf springs only characterised by means specially adapted for attaching the spring to axle or sprung part of the vehicle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F1/00—Springs
    • F16F1/02—Springs made of steel or other material having low internal friction; Wound, torsion, leaf, cup, ring or the like springs, the material of the spring not being relevant
    • F16F1/18—Leaf springs
    • F16F1/26—Attachments or mountings
    • F16F1/30—Attachments or mountings comprising intermediate pieces made of rubber or similar elastic material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2202/00—Indexing codes relating to the type of spring, damper or actuator
    • B60G2202/10—Type of spring
    • B60G2202/11—Leaf spring
    • B60G2202/112—Leaf spring longitudinally arranged
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2204/00—Indexing codes related to suspensions per se or to auxiliary parts
    • B60G2204/10—Mounting of suspension elements
    • B60G2204/12—Mounting of springs or dampers
    • B60G2204/121—Mounting of leaf springs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2204/00—Indexing codes related to suspensions per se or to auxiliary parts
    • B60G2204/10—Mounting of suspension elements
    • B60G2204/12—Mounting of springs or dampers
    • B60G2204/125—Mounting of rubber type springs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2204/00—Indexing codes related to suspensions per se or to auxiliary parts
    • B60G2204/40—Auxiliary suspension parts; Adjustment of suspensions
    • B60G2204/423—Rails, tubes, or the like, for guiding the movement of suspension elements
    • B60G2204/4232—Sliding mounts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2206/00—Indexing codes related to the manufacturing of suspensions: constructional features, the materials used, procedures or tools
    • B60G2206/01—Constructional features of suspension elements, e.g. arms, dampers, springs
    • B60G2206/60—Subframe construction
    • B60G2206/601—Hanger bracket

Definitions

  • This invention relates to a support assembly for supporting a free end of a parabolic leaf spring.
  • Figures 1 to 3 illustrate a prior art parabolic leaf spring assembly, typically used for supporting the axle or axles of a trailer.
  • the known assembly comprises a leaf spring 2 pivotally mounted at one end to a vehicle chassis or body 4 to which an axle (not shown) is attached at an intermediate point thereof, a free end 6 of the leaf spring being slidably supported on an inclined support plate 8 mounted on the chassis or body 4.
  • a rubber buffer 9 is mounted below the free end of the spring 2 to delimit downward motion of the free end 6 of the spring 2.
  • the angle between the free end 6 of the spring 2 relative to the surface of the inclined support plate 8 will change in accordance to the weight of the load on the trailer.
  • the free end 6 of the spring 2 will rarely be resting flush on the inclined support plate 8 (i.e. parallel to the surface of the support plate 8).
  • the support plate 8 is typically angled to match the angle of the free end of the spring 2 at a nominal or expected load, as shown in Figure 1 .
  • This frequent point contact between the free end 6 of the spring and the support plate 8 greatly increases the rate of wear on the spring 2 and support plate 8.
  • a support assembly for supporting a free end of a parabolic leaf spring, the support assembly comprising a support member having a support surface upon which said fee end of leaf spring may be slidably supported, said support member being pivotally mounted on the chassis or body to maintain the support surface parallel to said free end of the leaf spring to ensure even contact between the support surface and the free end of the leaf spring.
  • pivot axis of the support member extends horizontally and transverse to said leaf spring.
  • said assembly includes a resilient member supporting a leading end of the support member to bias the leading end of the support member in a substantially downwards direction, said resilient member permitting deflection of the leading end of the support surface of the support member in an upwards direction under the action of the free end of the leaf spring.
  • the pivot axis of the support member is located adjacent a trailing end of the support member.
  • the support surface of the support member has an upwardly curved leading end.
  • said resilient member comprises a hollow tube formed from a resilient material, said hollow tube being located above the leading end of the support member.
  • the resilient member may arranged to be compressed between the leading end of the support member and the chassis or body of the vehicle.
  • an upper face of the upwardly curved leading end of the support surface of the support member engages the resilient member.
  • said support member is pivotally mounted between a pair of side plates of a U shaped base member.
  • the resilient member is located between a base portion of the base member and the leading end of the support member.
  • a leaf spring assembly comprising a leaf spring pivotally mounted at one end to a vehicle chassis or body and which has an axle attached thereto at an intermediate point, a free end of the leaf spring being supported by a support assembly in accordance with the first aspect of the present invention.
  • a support assembly for supporting a free end 6 of a parabolic leaf spring 3 in accordance with an embodiment of the present invention comprises a support member 10 pivotally mounted between a pair of side plates of a spring hanger 12 mounted on the chassis or body 4 of a vehicle, such as a trailer.
  • the support member 10 is mounted on the spring hanger 12 for pivotal movement about a horizontal pivot axis extending transverse to the leaf spring.
  • the lower surface of the support member 10 defines a support surface adapted to engage and support a free end 6 of the parabolic leaf spring 2.
  • the pivotal mounting of the support member 10 enables the support surface of the support member to remain substantially parallel to the free end 6 of the leaf spring 3, regardless of the angle of the free end 6 of the leaf spring 3 and thus regardless of the load applied to the spring 3.
  • the pivot axis is arranged adjacent to a trailing end 14 of the support member 10.
  • the pivotal mounting of the support member 10 may be defined by a pivot bolt or spindle 16 passing between the side plates of the spring hanger 12 and through a receiving aperture or bush in the support member 10.
  • a portion of the support member defining a leading end 18 of the support member 10 is curved upwardly.
  • the resilient tube 20 is compressible to allow limited upward deflection of the leading end 18 of the support member 10 when the angle of the free end 6 of the spring 3 changes due to an increased load on the spring 3, as shown in Figures 5 and 6 .
  • the support member 10 will pivot according to the load on the spring 3 due to the resilient support of the leading end 18 if the support member 10 by the tube 20.
  • the resilient tube 20 will want to try and regain its original shape and thus will try push the leading end 18 of the support member 10 back down and thus the support surface of the support member 10 will always run in line with the free end 6 of the spring 3.
  • the resiliently biased pivotally mounted support member 10 provides an equalising effect, as regardless of the load on the trailer, the angle of the free end 6 of the spring 2 will be equal to that of the support surface of the support member 10, thereby reducing wear on the support surface and spring and providing a smoother and quieter ride.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Springs (AREA)
  • Vehicle Body Suspensions (AREA)

Abstract

A support assembly for supporting a free end of a parabolic leaf spring, the support assembly comprising a support member having a support surface upon which said fee end of leaf spring may be slidably supported, said support member being pivotally mounted on the chassis or body to maintain the support surface parallel to said free end of the leaf spring to ensure even contact between the support surface and the free end of the leaf spring.

Description

  • This invention relates to a support assembly for supporting a free end of a parabolic leaf spring.
  • Figures 1 to 3 illustrate a prior art parabolic leaf spring assembly, typically used for supporting the axle or axles of a trailer. The known assembly comprises a leaf spring 2 pivotally mounted at one end to a vehicle chassis or body 4 to which an axle (not shown) is attached at an intermediate point thereof, a free end 6 of the leaf spring being slidably supported on an inclined support plate 8 mounted on the chassis or body 4. A rubber buffer 9 is mounted below the free end of the spring 2 to delimit downward motion of the free end 6 of the spring 2.
  • With this known arrangement, the angle between the free end 6 of the spring 2 relative to the surface of the inclined support plate 8 will change in accordance to the weight of the load on the trailer. As a result, the free end 6 of the spring 2 will rarely be resting flush on the inclined support plate 8 (i.e. parallel to the surface of the support plate 8). The support plate 8 is typically angled to match the angle of the free end of the spring 2 at a nominal or expected load, as shown in Figure 1. This results in the free end 6 of the spring 2 engaging only the trailing end of the support plate 8 when the trailer is empty (as shown in Figure 2) or engaging only the leading end of the support plate 8 when the trailer is heavily loaded (as shown in Figure 3). This frequent point contact between the free end 6 of the spring and the support plate 8 greatly increases the rate of wear on the spring 2 and support plate 8.
  • Another issue with the traditional system is that, when the trailer is driving on rougher terrain or hits a typical road obstacle, the spring 2 will bounce down onto the bottom rubber buffer 9 and will then rebound up and strike the rigid support plate 8 attached to the chassis or body 4. This will cause an unpleasantly loud banging sound and will also be felt in the towing vehicle and can result in damage to the spring 2 and/or support plate 8 and associated components.
  • It is an object of the present invention to provide an improved support assembly for supporting a free end of a parabolic leaf spring that overcomes the abovementioned problems.
  • According to a first aspect of the present invention there is provided a support assembly for supporting a free end of a parabolic leaf spring, the support assembly comprising a support member having a support surface upon which said fee end of leaf spring may be slidably supported, said support member being pivotally mounted on the chassis or body to maintain the support surface parallel to said free end of the leaf spring to ensure even contact between the support surface and the free end of the leaf spring.
  • Preferably said pivot axis of the support member extends horizontally and transverse to said leaf spring.
  • Preferably said assembly includes a resilient member supporting a leading end of the support member to bias the leading end of the support member in a substantially downwards direction, said resilient member permitting deflection of the leading end of the support surface of the support member in an upwards direction under the action of the free end of the leaf spring. Preferably the pivot axis of the support member is located adjacent a trailing end of the support member.
  • Preferably the support surface of the support member has an upwardly curved leading end.
  • In one embodiment said resilient member comprises a hollow tube formed from a resilient material, said hollow tube being located above the leading end of the support member. The resilient member may arranged to be compressed between the leading end of the support member and the chassis or body of the vehicle. Preferably an upper face of the upwardly curved leading end of the support surface of the support member engages the resilient member.
  • Preferably said support member is pivotally mounted between a pair of side plates of a U shaped base member. Preferably the resilient member is located between a base portion of the base member and the leading end of the support member.
  • According to a second aspect of the present invention there is provided a leaf spring assembly comprising a leaf spring pivotally mounted at one end to a vehicle chassis or body and which has an axle attached thereto at an intermediate point, a free end of the leaf spring being supported by a support assembly in accordance with the first aspect of the present invention.
  • An embodiment of the present invention will now be described, by way of example only, with reference to the accompanying drawings, in which :-
    • Figure 4 is a side view of a leaf spring support assembly in accordance with an embodiment of the present invention under no load;
    • Figure 5 is a side view of the support assembly of Figure 1 under part load; and
    • Figure 6 is a side view of the support assembly of Figure 1 under full load.
  • A support assembly for supporting a free end 6 of a parabolic leaf spring 3 in accordance with an embodiment of the present invention comprises a support member 10 pivotally mounted between a pair of side plates of a spring hanger 12 mounted on the chassis or body 4 of a vehicle, such as a trailer. The support member 10 is mounted on the spring hanger 12 for pivotal movement about a horizontal pivot axis extending transverse to the leaf spring.
  • The lower surface of the support member 10 defines a support surface adapted to engage and support a free end 6 of the parabolic leaf spring 2. The pivotal mounting of the support member 10 enables the support surface of the support member to remain substantially parallel to the free end 6 of the leaf spring 3, regardless of the angle of the free end 6 of the leaf spring 3 and thus regardless of the load applied to the spring 3. The pivot axis is arranged adjacent to a trailing end 14 of the support member 10. The pivotal mounting of the support member 10 may be defined by a pivot bolt or spindle 16 passing between the side plates of the spring hanger 12 and through a receiving aperture or bush in the support member 10.
  • A portion of the support member defining a leading end 18 of the support member 10 is curved upwardly. A resilient tube 20, formed from a resilient material, preferably a polymeric material, such as rubber, is located between the side plates of the spring hanger 12, above the leading end 18 of the support member 10 to be engaged by the upwardly curved leading end 18 of the support member 10. The resilient tube 20 is compressible to allow limited upward deflection of the leading end 18 of the support member 10 when the angle of the free end 6 of the spring 3 changes due to an increased load on the spring 3, as shown in Figures 5 and 6. This maintains the support surface of the support member 10 parallel to the free end 6 of the spring 3 and acts as a shock absorber, biasing the leading end 18 of the support member 10 downwardly, thus maintaining contact between the support surface of the support member 10 and the free end 6 of the spring 3 as the load on the spring 3 varies during use of the trailer.
  • This helps to reduce the wear on the spring 3 and support member 10 and also promotes a smoother ride. The support member 10 will pivot according to the load on the spring 3 due to the resilient support of the leading end 18 if the support member 10 by the tube 20. The resilient tube 20 will want to try and regain its original shape and thus will try push the leading end 18 of the support member 10 back down and thus the support surface of the support member 10 will always run in line with the free end 6 of the spring 3.
  • The added benefit of this arrangement is that, when the trailer hits a bump and the spring rebounds away from and back towards the support member 10 and strikes the support member 10, the leading end 18 of the support member 10 will be deflected upwardly, compressing the resilient tube 20 and absorbing the impact. This creates a dampening affect and thus the driver of the towing vehicle does not feel the impact as much.
  • The resiliently biased pivotally mounted support member 10 provides an equalising effect, as regardless of the load on the trailer, the angle of the free end 6 of the spring 2 will be equal to that of the support surface of the support member 10, thereby reducing wear on the support surface and spring and providing a smoother and quieter ride.
  • The invention is not limited to the embodiment(s) described herein but can be amended or modified without departing from the scope of the present invention.

Claims (9)

  1. A support assembly for supporting a free end (6) of a parabolic leaf spring (2), the support assembly comprising a support member (10) having a support surface upon which said fee end (6) of leaf spring (2) may be slidably supported, said support member (10) being pivotally mounted on the chassis or body to maintain the support surface parallel to said free end (6) of the leaf spring (2) to ensure even contact between the support surface and the free end (6) of the leaf spring (2).
  2. An assembly as claimed in claim 1, wherein said pivot axis of the support member (10) extends horizontally and transverse to said leaf spring (2).
  3. An assembly as claimed in claim 2, comprising a resilient member (20) supporting a leading end (18) of the support member (10) to bias the leading end (18) of the support member (10) in a substantially downwards direction, said resilient member (20) permitting deflection of the leading end (18) of the support surface of the support member (10) in an upwards direction under the action of the free end (6) of the leaf spring (2).
  4. An assembly as claimed in claim 3, wherein the pivot axis of the support member (10) is located adjacent a trailing end (14) of the support member (10).
  5. An assembly as claimed in claim 3 or claim 4, wherein said resilient member (20) comprises a hollow tube formed from a resilient material, said hollow tube (20) being located above the leading end (18) of the support member (10).
  6. An assembly as claimed in any of claims 3 to 5, wherein the leading end (18) of the support member (10) curves upwardly, an upper face of the upwardly curved leading end (18) of the support surface engaging the resilient member (20).
  7. An assembly as claimed in any preceding claim, wherein said support member (10) is pivotally mounted between a pair of side plates of a U shaped base member or hanger (12).
  8. An assembly as claimed in claim 7 when dependent upon claim 3, wherein the resilient member (20) is located between a base portion of the base member (12) and the leading end (18) of the support member (10).
  9. A leaf spring assembly comprising a leaf spring (3) pivotally mounted at one end to a vehicle chassis or body and which has an axle attached thereto at an intermediate point, a free end (6) of the leaf spring (3) being supported by a support assembly in accordance with any of claims 1 to 8.
EP14180402.1A 2013-08-08 2014-08-08 Support assembly for supporting a free end of a parabolic leaf spring Active EP2835277B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1314188.2A GB2516945A (en) 2013-08-08 2013-08-08 Support Assembly for Supporting a Free End of a Parabolic Leaf Spring

Publications (2)

Publication Number Publication Date
EP2835277A1 true EP2835277A1 (en) 2015-02-11
EP2835277B1 EP2835277B1 (en) 2018-08-08

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP14180402.1A Active EP2835277B1 (en) 2013-08-08 2014-08-08 Support assembly for supporting a free end of a parabolic leaf spring

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EP (1) EP2835277B1 (en)
DK (1) DK2835277T3 (en)
GB (1) GB2516945A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019208165B3 (en) * 2019-06-05 2020-10-08 Volkswagen Aktiengesellschaft Leaf spring receptacle for receiving a leaf spring of a motor vehicle, leaf spring clamp and motor vehicle

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019200484A1 (en) 2019-01-16 2020-07-16 Ford Global Technologies, Llc Leaf spring assembly and vehicle

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1360135A (en) * 1919-12-22 1920-11-23 Charles M Mohler Spring-saddle and shock-absorber
DE548489C (en) * 1932-04-13 Fritz Preller Suspension for motor vehicles
GB679098A (en) * 1948-10-25 1952-09-10 Daimler Benz Ag Improvements relating to springing, particularly for motor vehicles
US2988352A (en) * 1959-06-12 1961-06-13 Neway Equipment Co Spring structure for automotive vehicles and the like
GB915402A (en) * 1960-05-20 1963-01-09 Jonas Woodhead & Sons Leeds Lt Improvements in or relating to spring assemblies for vehicles
DE1907183A1 (en) * 1968-02-16 1970-01-22 Dunlop Co Ltd Spring suspension for vehicles
US3920264A (en) * 1974-11-13 1975-11-18 James W Lafferty Vehicle low-load isolator spring suspension apparatus
EP0082426A1 (en) * 1981-12-23 1983-06-29 Bergische Achsenfabrik Fr. Kotz & Söhne Tandem axle system

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1339779A (en) * 1920-05-11 Spring saddle and shock-absorber
DE512847C (en) * 1929-10-11 1930-11-21 Anton Auer Support for the ends of the support leaf spring, especially in motor vehicles
DE3517239A1 (en) * 1985-05-13 1986-11-13 Brueninghaus Krupp Gmbh Leaf spring
US20070267790A1 (en) * 2006-05-19 2007-11-22 Textron Inc. Golf car sliding rear leaf spring
US20090115157A1 (en) * 2007-11-07 2009-05-07 Platner David K Leaf spring end mount interface

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE548489C (en) * 1932-04-13 Fritz Preller Suspension for motor vehicles
US1360135A (en) * 1919-12-22 1920-11-23 Charles M Mohler Spring-saddle and shock-absorber
GB679098A (en) * 1948-10-25 1952-09-10 Daimler Benz Ag Improvements relating to springing, particularly for motor vehicles
US2988352A (en) * 1959-06-12 1961-06-13 Neway Equipment Co Spring structure for automotive vehicles and the like
GB915402A (en) * 1960-05-20 1963-01-09 Jonas Woodhead & Sons Leeds Lt Improvements in or relating to spring assemblies for vehicles
DE1907183A1 (en) * 1968-02-16 1970-01-22 Dunlop Co Ltd Spring suspension for vehicles
US3920264A (en) * 1974-11-13 1975-11-18 James W Lafferty Vehicle low-load isolator spring suspension apparatus
EP0082426A1 (en) * 1981-12-23 1983-06-29 Bergische Achsenfabrik Fr. Kotz & Söhne Tandem axle system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019208165B3 (en) * 2019-06-05 2020-10-08 Volkswagen Aktiengesellschaft Leaf spring receptacle for receiving a leaf spring of a motor vehicle, leaf spring clamp and motor vehicle

Also Published As

Publication number Publication date
DK2835277T3 (en) 2018-11-19
EP2835277B1 (en) 2018-08-08
GB2516945A (en) 2015-02-11
GB201314188D0 (en) 2013-09-25

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